/Engine/Source/Runtime/MessagingCommon/Public/MessageEndpoint.h
Sends a message with fields and attachment to the specified recipient.
template<typename MessageType> void Send ( MessageType * Message, const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IMessageAttachment](API\Runtime\Messaging\IMessageAttachment), ESPMode::ThreadSafe > & Attachment, const [FMessageAddress](API\Runtime\Messaging\FMessageAddress) & Recipient )